Planoorapii co



. J. FRAME.

MULTISTAGE CENTRIFUGAL FAN AND PUMP.

APPLICATION FILED AUG-24. i918.

Patented July 8, 1919.

4 SHEETSSHEET l- 4 yP/v Tor flaaw THE COLUMBIA PLANOGRAPH C(L.WASHINOTON; D C.

W. J. FRAME.

MULTISTAGE CENTRIFUGAL FAN AND PUMP. APPUCATION FILED AUG-24,1918.

1,309,282. Patented July 8, 1919.

4 SHEETSSHEET 2.

Afr).

TIIE COLUMBIA PLANOURAPII cu" WASHINGTON. D. c.

.J. FRAME.

MULTISTAGE CENTRIFUGAL FAN AND PUMP.

APPLICATION FILED AUG-24.1918.

Patented July 8, 1919.

4 SHEETS-SHEET 3- ATT'YI THE COLUMBIA PLANOGRAPH cm. WASHINGTON. D. C.

W. J, FRAME.

mumsmss CENTRIFUGAL FAN AND PUMP.

APPLICATION FILED AUG-24. 1.9!8.

Patented July 8, 1919.

4 SHEETSSHEET 4.

ATT).

WILLIAM JOHNSTON FRAME, OF LONDON, ENGLAND.

MULTISTAGE CENTRIFUGAL FAN AND PUMP.

Specification of Letters Patent.

Patented July 8, 1919.

Application filed August 24, 1918. Serial N 0. 251,221.

To all whom it may concern 1 Be it known that I, WiLLIAM JOHNSTON FRAME,a subject of the King of England, and a resident of London MiddleseX,England, have invented certain new and useful Improvements in MultistageCentrifugal Fans and Pumps of which the following is a specification.

This invention relates to multi-stage centrifugal fans or pumps.

The object of this invention is to provide an improved fan or pump ofthis type. Ac cording to this invention I provide two or more separatesets or stages of fluid impelling blades or vanes in one or more rotorsrevolving in one compartment or chamber of a pump having one or morerotor compartments. s

The separate stages or fluid impelling blades act in series and eachrotor compartment has at least two central fluid inlet eyes leading thefluid into at least two separate stages of fluid impelling bladesrevolving within that compartment. i

This invention is further characterized in that the fluid in passing tothe central fluid inlet eye of a stage of rotor blading crosses the pathof the fluid passing to another central inlet eye of another stage ofrotor blading.

The fluid entering through any one of the central. inlet eyes into onerotor stage of impelling blades, is rotated by the blading, and isforced to issue from its periphery by the centrifugal action of same inthe usual manner. The fluid then preferably enters diffusing channels orsets of stationary guide vanes of the well known type, and is returnedthrough inward-flow guide passages back to another central inlet eye andpasses. through this eye, into a second stage of rotor impelling blades.

The fluid is acted on in the above manner passing through the abovecycle of flow and through the one rotor or rotors revolving in the onecompartment of the pump two or more times in series, the pressure thusincreasing.

Where the fluid passing to one central inlet eye of one rotor stagecrosses the path of the fluid passing to another central inlet eye ofanother rotor stage the crossing of these fluid paths is preferablycarried out through passages formed between the walls of the fixedreturn flow guide blades or passages which direct the fluid to the eyeof a previous or subsequent stage.

The crossing of the paths of the fluid on the return inward flow part ofthe cycle of flow insures against loss of pressure head which occurswhen the crossing of the fluid paths takes place on the outward flowpart of the cycle.

The separate stages of fluid impelling blades of the rotor or rotorsrevolving in the one compartment of the pump may discharge the fluid inmore than one direction, preferably either radial or parallel to theaxis of rotation of the rotor or rotors.

The fluid impelling blades of the rotor of the improved pump may bebackwardly inclined, radially or forwardly inclined desired, or they maybe formed of a combination of any of these.

Referring to the drawings filed herewith:

Figure 1 is a half section and half elevation of a two-stage pump madein accordance with this invention showing a two stage single rotorhaving the inlet eyes of the rotor looking in. the same direction:

Fig. 2 is a half end elevation and half end View of Fig. 1 with thecover a re moved;

Fig. 8 is a half section and half elevation of a four-stage pump havingtwo-stage 'rotors in two separate compartments with the inlet eyes ofthe rotors looking in the same direction; 7

Fig. l is a half section and half elevation of a four-stage pump havingtwo twostage rotors back to back within, the one compartment;

Fig. 5 is' a half end elevation and half cross section on line 5-5, Fig.i;

Fig. 6 is a half section and half elevation of a four-stage pump havingtwo two-stage rotors back to back within the one coinpartment, each ofthe rotors having one of its discharges at the periphery looking in anaxial direction and the other discharge looking in a radial direction;

Fig 7 is a half section and half elevation of a two-stage pump having asingle rotor running in one compartment with two central inlet eyelooking in two directions each of the two stages having two centralinlets into it.

Fig. 8 is a half section and half elevation k a I of a three-stage pumphaving one threestage rotor in the one compartment with two eyes lookingin one direction and one eye in the opposite direction, and having thedischarge annulus or scroll formed between the diffuser of the laststage but one and the return inward flow passages to the last stage.

Fig. 9 is a half end elevation and half cross section on line 99 of Fig.8, showing discharge annulus or scroll outlet passing through thepassage way leading from the delivery of the last stage but one to theinlet of the last stage;

Fig. 10 is a half section and half elevation of a three-stage pumphaving one twostage rotor in one compartment and one single stageimpeller in a second compartment;

Fig. 11 is a half section and half elevation of a four-stage pump havingtwo twostage rotors in two separate compartments and having their inleteyes looking in opposite directions also the pump discharge disposedoutside the return inward-flow passages to the last stage so that thefluid flows from the bladed annulus (formed between the diffuser of thelast stage but one and the return inward-flow passages to the laststage) through passages formed between the walls of the fixed blades ofthe said inward flow passages to the said discharge;

Fig. 12 is a half section and half elevation of a five-stage pump havingone threestage rotor with two inlet eyes lookingin one direction and athird eye in opposite direction within one compartment and one two-stagerotor with inlet eyes looking in opposite directions within a. secondcompartment;

Fig. 13 is a half end elevation and half cross section on line 1313,Figs. 10, 11 and 12, the dotted lines showing the dis charge in theexamples shown in Figs. 11 and 12.

a is the casing provided with a cover a, Z) the shaft mounted on ballbearings c, d is the inlet and e the discharge.

In the form shown in Figs. 1 and 2, the rotor is a two-stage rotor andis provided with two sets of fluid impelling blades g and h leading fromtwo separate central and contiguous inlets j and 7c. The casing a isprovided with an annular diffusing chamber m into which the first set ofblades 5/ discharge and return inward-flow passages bounded on two sidesby walls 0 0 of the fixed blades. Between the walls 0 0 are ducts 79,see Fig. 2.

The blades h of the second stage of the rotor deliver the fluid into adiffusing annulus g and thence to the delivery scroll 1".

In operation the fluid enters the casing a at (Z, passes into theannular chamber .9, through the ducts p to the annular chamber t andthence to the eye of the first stage of the rotor. The fluid then passesthrough the first stage of the rotor and into the diffusing chamber m,then through the return inward-flow passages n to the eye k of thesecond stage of the rotor from which it is delivered to the diflusingchamber 9 and scroll r.

The form shown in Fig. 3 is a duplication of the form shown in Figs. 1and 2. After the fluid leaves the second stage of the rotor 72. itenters the diffuser g and chamber 8 which is provided with fixed guideblades 8 passes through the ducts between the walls of the returninward-flow passages a into the eye of the third stage, then takes acourse similar to that which it took in passing through the first stage.The fluid is delivered through the diffuser annulus g to the scroll rand outlet 6.

The form shown in Figs. 4 and 5 is similar to the form shown in Fig. 3excepting that the rotor of the third and fourth stages is back to backwith the rotor 01" the first and second stages. The fluid after leavingthe second stage it of the first rotor is delivered through diffuser gto the annular chamber or scroll to from the discharge outlet w of whichit is conveyed by a pipe 2 to the fluid inlet into third stage and theannular chamber 3. The fluid then passes through the ducts between thewalls 0 of the fixed guide blades of the return inward flow passages(see Fig. 5) taking a course similar to that taken through the first twostages of the pump and discharging into and through the annular chamberor scroll 1 and outlet 6. Instead of there being two rotors back toback, the four stages could be carried in a single rotor with a centralrib.

The form shown in Fig. 6 is similar to the form shown in Fig. 4 but eachrotor has one of its discharges 6 and 7 looking in an axial directionand the other discharges 8 and 9 looking in the radial direction. Thisis applicable to all rotors of improved pump.

The form shown in Fig. 7 is similar to that shown in 4 excepting thatthe fluid enters through the casing inlets (Z cl at the one pressure.The fluid passes then through the ducts 29 (see Fig. 5) in the returnflow guide blades and in through the central inlet eyes 7' j into thetwo outer sets of rotor blades 9 g which form the first stage. The fluidpasses out of the first stage blading into the annuli m m and throughthe return flow guide passages 01. n into the two central inner inlets7:: 7c and into the second stage blading h h from which it issued intothe single annulus g and scroll n passing out at the one discharge 6.

The pressure of the fluid passing through the two outer sets of rotorblades g 9 forming the first stage is therefore the same.

Also the pressure of the fluid passing through the two inner sets it his the same and therefore each of the two stages of this pump has twocentral inlet eyes leading into it.

Two or more of the two stage pumps as shown in Fig. 7 may work in serieson one driving shaft. 7

The form shown in Figs. 8 and 9 is a combination of the form shown inFig. 1 with a third stage on the back of the same rotor, or a separaterotor may be used for the third stage with its back to the first rotor."

In the form shown in Figs. 10 and 13the fluid after passing'through thefirst set of "rotor blades passes through the dif 7 charge fusingchamber m, through the return inward flow passages 3 to the eye is ofthe second stage of rotor blades, through which it passes into thediffusing chamber g and bladed annular chamber 1 1, through the ducts psee Fig. 13, disposed between the walls of the fixed guide blades of theinward return flow passages 3 through the annular chamber 15 to the eye16 of the third stage, through the third set of rotor blades 17 to thedischarge annulus 18 and dis- Each fixed blade in chamber 14 is shown ats Fig. 13, as an extension of one of the walls 0 of one of the fixedguide blades forming the passages 3.

In the form shown in Figs. 11 and 13 the course of the fluid through thefirst two stages is similar to that described with reference to thefirst two stages of Fig. 10. After leaving the second stage h of thefirst rotor the fluid passes into and through the bladed annular chamber14, through ducts 7), see Fig. 13, disposed between the walls of thefixed blades of the return inward flow passages 3 through the chamber20, then through the third and fourth stages of the second rotor intoand through the bladed annular chamber 21 with blades .9 see Fig. 13through the ducts disposed between the Walls of the fixed guide bladesof the return inward flow passages n and annulus s to the pump discharge6 disposed outside the return inward flow passages 3.

The form shown in Figs. 12 and 13 is a five-stage pump. The fluid passesthrough the first three stages in a manner described with reference toFigs. 8 and 9. After leaving the third-stage of the first rotor thefluid passes into and through the bladed annular chamber 22 with blades3 through ducts 20 see Fig. 13, disposed between the walls of the fixedguide blades of the return inward flow passages 3 into and through thechamber 20, then through the fourth and fifth stages in a mannerdescribed with reference to Figs. 11 and 13.

It will be readily seen that other combinations can be obtained withoutdeparting from the spirit of the invention.

lVliat I claim and desire to secure by Letters Patent is 1. Acentrifugal multi-stage fan or pump comprising a casing, at least onerotor compartn'ient in said casing, at least one rotor in said rotorcompartment, a plurality of separate sets of rotor fluid impellingblades acting in series in said rotor compartment, return'inward flowfluid guide passages in said casing, cross fluid passages disposedtransversely of the said inward flow fluid pas sages, said inward flowfluid passages leading the fluid to one of the separate sets of rotorfluid impelling blades and said cross fluid passages conveying the fluidto another of the separate sets of rotor fluid impelling blades.

2. A centrifugal multi-stage fan or pump comprising a casing, at leastone rotor compartment in said casing, at least one rotor in said rotorcompartment, a plurality of separate sets of rotor fluid impellingblades acting in series in said rotor compartment, return inward flowfluid guide passages in said casing, cross fluid passages disposedtransversely of the said inward flow fluid passage, said inward flowfluid passages leading the fluid to one of the separate sets of rotorfluid impelling blades and said cross fluid passages conveying the fluidto another of the separate sets of rotor fluid impelling blades, saidseparate sets of fluid impelling blades act in series in any one rotorcompartment of the pump and have at least two separate central fluidinlet eyes into said separate sets of rotor blading, one of the eyesbeing formed as an annulus contiguous outside another.

3. A centrifugal multi stage fan or pump comprising a casing, at leastone rotor compartment in said casing, at least one rotor in 1 said rotorcompartment a plurality of separate sets of rotor fluid impelling bladesacting in series in said rotor compartment, return inward flow fluidguide passages in said casing, cross fluid passages disposedtransversely of the said inward flow fluid passages, said inward flowfluid passages leading the fluid to one of the separate sets of rotorfluid impelling blades and said cross fluid passages conveying the fluidto another of the separate sets of rotor fluid impelling blades, saidseparate sets of fluid impelling comprising a casing, at least one rotorcompartment in said casing, at least one rotor in said rotorcompartment, a plurality of separate sets of rotor fluid impellingblades acting in series in said rotor compartment, guide blades in saidcasing forming return inward flow fluid passages, cross fluid passagesin said guide blades, said inward flow fluid passages leading the fluidto one of the separate sets of rotor fluid impelling blades and saidcross fluid passages conveying the fluid to another of the separate setsof rotor fluid impelling blades.

5. A centrifugal multi-stage fan or pump comprising a casing, at leastone rotor compartment in said casing, at least one rotor in said rotorcompartment, a plurality of separate sets of rotor fluid impellingblades acting in series, in said rotor compartment, return inward flowfluid guide passages in said casing, cross fluid passages disposedtransversely of the said inward flow fluid passages, said inward flowfluid passages lead-.

ing the fluid to one of the separate sets of fluid impelling blades of arotor in one compartment of the pump and said cross fluid passagesconveying the fluid to one of the separate sets of rotor fluid impellingblades in another rotor compartment of the pump.

In testimony whereof I have signed my name to this specification. V

lVILLIAlVI JOHNSTON FRAME.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

